package com.itheima.reggie.controller;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * 购物车
 */
@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     * /@param shoppingCart
     *
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> save(@RequestBody ShoppingCart shoppingCart) {
        log.info("购物车数据:{}", shoppingCart);
        //设置用户id，指定当前是哪个用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //添加到购物车的是菜品
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        if (shoppingCart.getDishId() != null) {
            lqw.eq(ShoppingCart::getDishId, shoppingCart.getDishId());
        }
        //添加到购物车的是套餐
        else {
            lqw.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }
        //查询当前菜品或者套餐是否在购物车中
        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(lqw);
        //如果已经存在，就在原来数量基础上加一
        if (cartServiceOne != null) {
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        }
        //如果不存在，则添加到购物车，数量默认就是一
        else {
            shoppingCart.setNumber(1);
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     *
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list() {
        log.info("查看购物车...");

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);
        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        return R.success(list);
    }

    /*
     * 清空购物车
     * */
    @DeleteMapping("/clean")
    public R<String> delete() {
        //SQL:delete from shopping_cart where user_id = ?
        Long userId = BaseContext.getCurrentId();
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId, userId);
        shoppingCartService.remove(lqw);
        return R.success("清空购物车成功");
    }

    /*
     * 删除购物车中的商品
     * */
    @PostMapping("/sub")
    public R<String> sub(@RequestBody ShoppingCart shoppingCart) {
        //设置用户id，指定当前是哪个用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //添加到购物车的是菜品
        LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
        lqw.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        if (shoppingCart.getDishId() != null) {
            lqw.eq(ShoppingCart::getDishId, shoppingCart.getDishId());
        }
        //添加到购物车的是套餐
        else {
            lqw.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }
        //查询当前菜品或者套餐是否在购物车中
        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(lqw);
        //如果已经存在，就在原来数量基础上加一
        if (cartServiceOne.getNumber() > 1) {
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number - 1);
            shoppingCartService.updateById(cartServiceOne);
        }
        //否则购物车信息
        else {
           shoppingCartService.removeById(cartServiceOne.getId());
        }
        return R.success("以删除购物车中的商品");
    }
}

